Παραπομπή APA

Erskine, L. G. (1966). Protect your profit margins. AMA.

Παραπομπή Chicago Style

Erskine, Louis Gillespie. Protect Your Profit Margins. New York: AMA, 1966.

Παραπομπή MLA

Erskine, Louis Gillespie. Protect Your Profit Margins. AMA, 1966.